A system includes a computer including a processor and a memory, the memory storing instructions executable by the processor to identify a wheel having a force imbalance based on wheel speed data from each of a plurality of vehicle wheels, and to identify a wheel force imbalance fault when the force imbalance exceeds at least one of a distance threshold and a time threshold.

A system for determining a tire pressure status in a vehicle is provided. The system includes at least one processing device, which may be arranged to: estimate values of a set of predetermined vehicle parameters; calculate a tire pressure parameter as a predetermined function of the values of the set of predetermined vehicle parameters, wherein said predetermined function has been generated by training a machine learning system, such as, for example, a neural network or a Support Vector Machine, using values of a large number of sets of predetermined vehicle parameters and associated tire pressure parameters; and determine a tire pressure status, indicating whether or not there is tire under-inflation, by comparing said tire pressure parameter with a threshold.

A system for determining a tire change status in a vehicle is provided. The system includes at least one processing device and a storage device. The at least one processing device may be arranged to: calculate a value of at least one reference parameter which may be used in indirect tire pressure monitoring; store the calculated value of said at least one reference parameter in the storage device; retrieve a previously stored value of said at least one reference parameter from the storage device; determine a similarity parameter based on a similarity between the calculated value and the previously stored value of said at least one reference parameter; and determine a tire change status, indicating whether or not the tires have been re-filled or replaced, by comparing said similarity parameter with a threshold.

An apparatus for monitoring a tire pressure includes a controller configured to determine whether vehicle state information and tire information satisfy a reference condition when a reset button of a tire pressure is operated, detect the tire pressure when the vehicle state information and the tire information satisfy the reference condition, and reset the tire pressure when the tire pressure is within a reference pressure range.

An apparatus for estimating a tire resonance frequency may include a sensor for detecting rotation of a tone wheel; and a signal processor for calculating the detected rotation to produce a corrected wheel speed, filtering the corrected wheel speed in a predetermined manner to produce a filtered wheel speed from which engine noise is removed, and estimating a resonance frequency of a tire using the filtered wheel speed.

An apparatus and a method for monitoring a tire pressure of a vehicle are provided. The apparatus for monitoring a tire pressure of a vehicle according to the present disclosure includes a first sensor configured for measuring a tire pressure of one of first to fourth wheels of the vehicle, a plurality of second sensors configured for respectively measuring wheel speeds of the first to fourth wheels, an analysis device configured for analyzing tire pressures of the first to fourth wheels based on a measured value from the first sensor and measured values from the second sensors, and a controller configured for determining a tire in a low-pressure state based on the tire pressure analysis results of the first to fourth wheels.

A system includes a computer including a processor and a memory, the memory storing instructions executable by the processor to identify a wheel having a force imbalance based on wheel speed data from each of a plurality of vehicle wheels, and to identify a wheel force imbalance fault when the force imbalance exceeds at least one of a distance threshold and a time threshold.

A method for identifying at least one emitter for monitoring the tire pressure of a motor vehicle by association with one of the wheels of the motor vehicle. The method includes: for each emitter monitoring tire pressure, reconstructing an intermediate-frequency signal from the radiofrequency signal and a reference signal, determining the FFT of the intermediate-frequency signal, determining whether there is a frequency deviation of the intermediate-frequency signal, determining the side of the vehicle on which the emitter monitoring the pressure of a tire is placed, acquiring a signal from the anti-lock braking system for at least one of the wheels on the side on which it was determined that the emitter for monitoring the pressure of a tire is placed, and determining the position of the emitter for monitoring the pressure of a tire depending on the deviation and on the at least one signal from the anti-lock braking system.

A method for checking and/or monitoring the use of a tire (1) mounted on a vehicle (7), comprises the following steps: acquisition, by a microphone (10) arranged inside the tire, of an acoustic response of said tire (1) obtained under the effect of a pulsed mechanical stress thereon, and processing of said response in the frequency domain, characterized in that said processing identifies, in the response in the frequency domain, two spectrum spikes situated on either side of a reference frequency corresponding to the first cavity mode of the tire and, as a function of the frequency deviation between the two duly identified spikes, determines information relating to at least one parameter of use of the tire.

A device for determining a rotational speed and a vibration of a wheel end of a vehicle, in particular a truck, is disclosed. The device includes a single sensor measuring a signal during a rotation of the wheel end. The sensor is arranged at the wheel end, and a determination unit for determining the rotational speed and the vibration of the wheel end using the signal of the single sensor is provided.